Here you can see the redstone circuit for the hidden staircase, which in itself is very simple. Who wants to have it more secure can use e.g. a frame lock or another encryption.
Instructions:

Above you can see a possible camouflage for the stairs, at the end of which can be, for example, an armor rack, a mine shaft, a secret room or something else. The redstone circuit is simple in itself, but can also be enlarged, for example.

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Dislike; you still have to place a layer of earth around the secret entrance to be invisible and that can be avoided with double-piston-extender or slimeblocks.
I finds good and that you can see the lever is not bad.
I'll give it a like.
The idea is good.
The implementation is acceptable
The rating is neutral
Reason: there are better options that I like more myself.
So the idea itself is really great, especially since I'm also building a bunker, but I will find another implementation, no offense:ermm:
Still I give a like
An idea in itself, but not a particularly good one.
Cool, only unfortunately not on the mobile phone
🙂